When enabled, file composition times will start at zero, composition times in the 'ctts' (composition time to sample)
box for B-frames will be negative, and a 'cslg' (composition shift least greatest) box will be included per 14496-1
amendment 1.

When enabled, file composition times will start at zero, composition times in the 'ctts' (composition time to sample)
box for B-frames will be negative, and a 'cslg' (composition shift least greatest) box will be included per 14496-1
amendment 1.